Fixing bolt

ABSTRACT

A fixing bolt contains: a flexible sleeve and a locking nail. The flexible sleeve includes an internal threaded section, a conical groove, multiple engagement ribs, and multiple projected wings. The locking nail includes an external threaded section configured to movably screw with the internal threaded section of the flexible sleeve, a driving head, and a forcing portion. A bottom tip of the conical groove is located on a central position of a central axis of the flexible sleeve, any two adjacent of the multiple engagement ribs are spaced by each of multiple slits, the multiple slits intersect with one another on the central position of the central axis of the flexible sleeve, and the multiple slits are in communication with the bottom tip of the conical groove. Furthermore, the forcing portion of the locking nail is conical and has a conical face and a tip.

FIELD OF THE INVENTION

The present invention relates to a fixing bolt which is employed to fix a workpiece on a wall and is removed from the wall easily.

BACKGROUND OF THE INVENTION

Referring to FIG. 7, a conventional fixing bolt contains locking stein 90, a flexible sleeve 91, an adjustable tube 92, and two nuts 93. The locking stein 90 has a first outer threaded section 900 configured to screw with an inner wall of the adjustable tube 92, and the flexible sleeve 91 has a second outer threaded section 910 configured to screw with the inner wall of the adjustable tube 92. The locking stein 90 has a first end extending out of the adjustable tube 92 and has a second end screwed with the two nuts 92, wherein the two nuts 93 are movably screwed with the locking stein 90 and the flexible sleeve 91.

As shown in FIG. 8, a wrench is fitted with a hexagonal head 91 of the flexible sleeve 91 and rotates the locking stein 90 to move backwardly, wherein a forcing edge 901 of the locking stein 90 forces a retaining paw 912 on a front end of the flexible sleeve 91 to expand outwardly, such that the retaining paw 912 abuts against an inner wall of an orifice 94. Thereafter, the wrench is fitted with a hexagonal head 920 of the adjustable tube 92 and rotates the adjustable tube 92 so as to move into the orifice 94, thus locking the conventional fixing bolt in the orifice 94. In addition, the locking stein 90, the flexible sleeve 91, and the adjustable tube 92 are removed from the orifice 94 so as to unlock the conventional fixing bolt from the wall.

However, the conventional fixing bolt is complicated and is removed from the wall troublesomely.

The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide a fixing bolt which is simplified so as to reduce manufacture cost.

Further objective of the present invention is to provide a fixing bolt which fixes the workpiece on the wall quickly and easily.

Another objective of the present invention is to provide a fixing bolt which is removed from the wall conveniently.

To obtain the above objectives, a fixing bolt provided by the present invention contains: a flexible sleeve and a locking nail.

The flexible sleeve includes an internal threaded section formed on an inner wall of the flexible sleeve, a conical groove defined below the inner threaded section, multiple engagement ribs arranged on a first end of an outer wall of the flexible sleeve, and multiple projected wings arranged on a second end of the outer wall the flexible sleeve.

The locking nail includes an external threaded section configured to movably screw with the internal threaded section of the flexible sleeve so that the locking nail axially moves in the flexible sleeve, the locking nail further includes a driving head formed on a first end of the locking nail, and the locking nail includes a forcing portion formed on a second end of the locking nail.

Preferably, a bottom tip of the conical groove is located on a central position of a central axis of the flexible sleeve, any two adjacent of the multiple engagement ribs are spaced by each of multiple slits, the multiple slits intersect with one another on the central position of the central axis of the flexible sleeve, and the multiple slits are in communication with the bottom tip of the conical groove.

Preferably, the forcing portion of the locking nail is conical and has a conical face and a tip formed on a distal end of the forcing portion, such that when the locking nail is rotated, the forcing portion moves in the conical groove of the flexible sleeve so as to outwardly expand or inwardly retract the engagement ribs.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing the assembly of a fixing bolt according to a preferred embodiment of the present invention.

FIG. 2 is a perspective view showing the exploded components of the fixing bolt according to the preferred embodiment of the present invention.

FIG. 3 is a cross sectional view showing the assembly of the fixing bolt according to the preferred embodiment of the present invention.

FIG. 4 is another cross sectional view showing the assembly of the fixing bolt according to the preferred embodiment of the present invention.

FIG. 5 is a cross sectional view showing the operation of the fixing bolt according to the preferred embodiment of the present invention.

FIG. 6 is another cross sectional view showing the operation of the fixing bolt according to the preferred embodiment of the present invention.

FIG. 7 is a perspective view showing the exploded components of a conventional fixing bolt.

FIG. 8 is a cross sectional view showing the assembly of the conventional fixing bolt.

DETAILED DESCRIPTION OF THE FIRST EMBODIMENTS

With reference to FIG. 1, a fixing bolt according to a preferred embodiment of the present invention is employed to fix a workpiece 3 on a wall, and the fixing bolt comprises: a flexible sleeve 1 and a locking nail 2.

Referring further to FIGS. 2 and 3, the flexible sleeve 1 is hollow, and the flexible sleeve 1 includes an internal threaded section 10 formed on an inner wall thereof and a conical groove 11 defined below the inner threaded section 10, wherein a bottom tip of the conical groove 11 is located on a central position of a central axis of the flexible sleeve 1, and the flexible sleeve 1 further includes multiple engagement ribs 12 arranged on a first end of an outer wall of the flexible sleeve 1, wherein any two adjacent of the multiple engagement ribs 12 are spaced by each of multiple slits 13, the multiple slits 13 intersect with one another on the central position of the central axis of the flexible sleeve 1 (i.e., an intersection portion A of the bottom tip of the conical groove 11, as shown in FIG. 4), and the multiple slits 13 are in communication with the bottom tip of the conical groove 11.

The flexible sleeve 1 further includes multiple projected wings 14 arranged on a second end of the outer wall thereof, and the flexible sleeve 1 includes multiple retaining slots 15 axially formed around the multiple engagement ribs 12, wherein the multiple retaining slots 15 includes a plurality of protrusions 150 and indentations 151 radially arranged on the multiple engagement ribs 12.

The locking nail 2 includes an external threaded section 20 configured to movably screw with the internal threaded section 10 of the flexible sleeve 1 so that the locking nail 2 axially moves in the flexible sleeve 1. The locking nail 2 further includes a driving head 21 formed on a first end thereof and includes a forcing portion 22 formed on a second end of the locking nail 2, wherein the forcing portion 22 is conical and has a conical face 221 and a tip 220 formed on a distal end of the forcing portion 22, such that when the locking nail 2 is rotated, the forcing portion 22 moves in the conical groove 11 of the flexible sleeve 1 so as to outwardly expand or inwardly retract the engagement ribs 12.

The driving head 21 has a circular stop tab 23 formed on a bottom thereof, and the circular stop tab 23 has a toothed contacting section 230 arranged on a bottom thereof, such that the toothed contacting section 230 contacts with the workpiece 3 matingly so as to avoid a removal of the locking nail 2 as the locking nail 2 is rotated.

As shown in FIG. 3, in operation, the flexible sleeve 1 is inserted into an orifice of the wall so that the multiple projected wings 14 of the flexible sleeve 1 contact with the orifice (as illustrated in FIGS. 3 and 4), hence the flexible sleeve 1 does not revolve as the locking nail 2 is rotated.

With reference to FIG. 5, after the flexible sleeve 1 is secured in the orifice of the wall, the driving head 21 is driven by a hand tool so as to rotate the locking nail 2, the external threaded section 20 of the locking nail 2 screws with the internal threaded section 10 of the flexible sleeve 1, and the forcing portion 22 of the locking nail 2 axially moves into the conical groove 11 of the flexible sleeve 1. When the locking nail 2 is rotated further, the tip 220 of the forcing portion 22 moves into the intersection portion A (as shown in FIG. 4) of the bottom tip of the conical groove 11, and the conical face 221 of the forcing portion 22 forces the multiple engagement ribs 12 to expand outwardly, hence the multiple retaining slots 15 of the multiple engagement ribs 12 abut against the orifice of the wall so that the workpiece 3 is fixed on the wall securely by the fixing bolt.

Referring to FIG. 6, the locking nail 2 is removably rotated so that the conical face 221 of the forcing portion 22 of the locking nail 2 removes from the engagement ribs 12, in the meantime, the external threaded section 20 of the locking nail 2 screws with the internal threaded section 10 of the flexible sleeve 1 so as to remove the fixing bolt from the orifice of the wall.

Thereby, the fixing bolt of the present invention is simplified (i.e., the fixing bolt only includes the flexible sleeve 1 and the locking nail 2) so as to reduce manufacture cost. Furthermore, the fixing bolt fixes the workpiece on the wall quickly and easily. Preferably, the fixing bolt is removed from the wall conveniently.

While the first embodiments of the invention have been set forth for the purpose of disclosure, modifications of the disclosed embodiments of the invention as well as other embodiments thereof may occur to those skilled in the art. The scope of the claims should not be limited by the first embodiments set forth in the examples, but should be given the broadest interpretation consistent with the description as a whole. 

What is claimed is:
 1. A fixing bolt comprising: a flexible sleeve including an internal threaded section formed on an inner wall of the flexible sleeve, a conical groove defined below the inner threaded section, multiple engagement ribs arranged on a first end of an outer wall of the flexible sleeve, and multiple projected wings arranged on a second end of the outer wall the flexible sleeve; a locking nail including an external threaded section configured to movably screw with the internal threaded section of the flexible sleeve so that the locking nail axially moves in the flexible sleeve, the locking nail further including a driving head formed on a first end of the locking nail, and the locking nail including a forcing portion formed on a second end of the locking nail; wherein a bottom tip of the conical groove is located on a central position of a central axis of the flexible sleeve, any two adjacent of the multiple engagement ribs are spaced by each of multiple slits, the multiple slits intersect with one another on the central position of the central axis of the flexible sleeve, and the multiple slits are in communication with the bottom tip of the conical groove; and wherein the forcing portion of the locking nail is conical and has a conical face and a tip formed on a distal end of the forcing portion, such that when the locking nail is rotated, the forcing portion moves in the conical groove of the flexible sleeve so as to outwardly expand or inwardly retract the engagement ribs.
 2. The fixing bolt as claimed in claim 1, wherein the flexible sleeve further includes multiple retaining slots axially formed around the multiple engagement ribs.
 3. The fixing bolt as claimed in claim 2, wherein the multiple retaining slots have a plurality of protrusions and indentations radially arranged on the multiple engagement ribs.
 4. The fixing bolt as claimed in claim 1, wherein the driving head has a circular stop tab formed on a bottom thereof, and the circular stop tab has a toothed contacting section arranged on a bottom thereof. 